Lock.



A. ARBNS & E. L. THIGH.

' LOCK. 1

APPLICATION 11.31) 11211.27, 1910.

990,795 Patnted Apr. 25, 1911.

A u GU 5 TA PEN a SWUWW .S

. E LJ.7 E'TI If,

UNITED PATENT OFFICE.

AUGUST ARENS AND ERNEST I1. TEIGH, OF NEIV BRITAIN, CONNECTICUT,ASSIG-NORS TO I. & F. GORBIN, NEW BRITAIN, CONNECTICUT, A. CORPORATIONOF CON- LOCK.

Specification of Letters Patent.

Application filed April 27, 1910.

Patented Apr. 25, 1911.

Serial No. 558,029.

To all whom it may concern:

Be it known that we, AUGUST ARnNs and ERNEST L. TEICH, citizens of theUnited States, residing at New Britain, county of Hartford. State ofConnecticut,have invented certain new and useful Improvements in Locks,of which the following is a full, clear, and exact description.

Our invention relates to looks and is particularly concerned with a lockhaving a normally spring projected latch bolt and having means for deadlocking the latch bolt against retraction from the outside of the doorby means preferably of a thumbturn operable from the inside of the door.

The object of the invention is to provide a lock of this construction,wherein the parts are so arranged that the latch bolt will always befree for retraction when the door is open, so that, should the door hepushed shut without at the same time retracting the latch bolt by meansof the knob, said latch bolt will always yield upon coming in contactwith the striker-plate and permit the door to close fully; and also toprevent in jury to either the latch bolt or the strikerplate by a blowof a rigidly held latch bolt on said striker-plate.

Vith these objects in view, the invention consists in the constructionand arrangement of parts, a preferred embodiment of which is illustratedin the accompanyingdrawings, in which, I

Figure 1 is a side view of a lock embodying the invention with the capplate removed, showing the interior mechanism; Fig. 2 is a fragmentaryview similar to Fig. 1 showing the latch bolt dead-locking mechanism inoperative position; Fig. 3 comprises an edge and side view respectivelyof the latch vbolt dead-locking member; and, Fig. 4 comprises a side andend view respectively of the member for blocking the operation of thedead-locking mechanism.

In the embodiment of our invention herein selected for illustration, 1indicates the lock case, having a face plate 2.

3 indicates a normally spring-projected latch bolt having a stem 4carrying a coiled spring 5 between the head of the bolt and a guide lug6 on the lock case, said stem also having a tail-piece 7, with which thecam arm of any suitable construction of cylinldep lock may engage toretract the latch knobs or keys.

8 is a latch bolt dead-locking member slidably mounted in the lock caseand guided by suitable lugs 9 and 10.

11 indicates a roll-back which is connect ed by means of a spindle 12with a suitable thumb-turn (not shown) operable from the inner side ofthe door. Said roll-back is provided with an arm 13 engaging a notch 1ain the dogging member 8.

15 indicates a spring mounted in the lock case and arranged to contactwith suitable cam faces on the roll-back 11 to hold the same in eitherof its operative positions.

When the dead-locking member 8 is in the position indicated in Fig. 1,the latch bolt may be freely retracted either by the latch boltretracting yoke 16, which cooperates with the usual roll-back 17connected with the door knobs (not shown) or by means of a key of thecylinder lock (not shown) in the usual manner. When, however, thedead-locking member 8 has been moved to the position indicated in Fig. 2behind the tail-piece '7 of the latch bolt, said latch bolt is lookedagainst operation either by the It is to be observed that before thedoor can be opened from the inside by the knob, the dead-locking member8 must be raised to inoperative position as indicated in Fig. 1, therebyreleasing the latch bolt.

In order to prevent blocking the latch bolt by means of the dead-lockingmechanism when the door is open, and thereby prevent injury either tothe latch bolt or striker-plate by the pushing of the door to with. thelatch bolt rigidly held. means is provided for preventing the turning ofthe roll-back 11 to move the dead-locking member to operative positionwhen the door is opened. For this purpose is provided pivoted dog 18which is normally held by a spring 19 with one end 20 closely adjacentto or in contact with the spring 15 on the side opposite the roll-backas shown in Fig. 1 whereby when said dog is free to stand in theposition indicated in Fig. 1, the operation of the roll-back 11 isprevented, and the dead-locking member 8 and roll-back 11 and dog 18 areso" relatively arranged that this blocking action takes place only whenthe dead-locking member is in operative position.

In order to free the blocking dog 18 out of position with respect to theroll-back when the door is closed, said dog is provided with an arm 21,which lies in the path of the shank 22 of the usual safety member 23,which is employed to prevent retraction of the latch bolt by insertionof a thin blade between the striker-plate and the face-plate in thelock, as is well known to those familiar with this art. When the door isopen, the safety member 23 is thrown into .projectedposition by means ofits spring sition before the door can be opened and will be held lockedin such inoperative position as long as the door remains open, therebyinvariably leaving the latoh-bolt free for re traction by contact withthe striker-plate when the door is pushed to.

While we have herein described the pre ferred embodiment of ourinvention, itis to be understood that the same may be modified in detailand relative arrangement of parts within the scope of the appendedclaims.

What we claim is:

1. In a lock, the combination with a spring projected latch bolt, deadlocking means therefor and means for moving the latter to operativeposition from the inner side of the door, of means for automaticallyblocking the movement of said dead-locking means into operative positionwhen the door is opened.

2. In a lock, the combination with a spring projected latch bolt, adead-locking member therefor and means for moving the latter tooperative position from the inner side of the door, of means topositively block the move-v ment of said member into operative positionwhen the door is open and means to auton'iatically release said memberfrom said blocking means when the door is closed.

3. In a lock, the combination with a spring projected latch bolt adead-locking mechanism therefor and means for moving the latter tooperative position from the inner side of the door, of means forpositively blocking the movement of said mechanism to operative positionwhen the door is open, and a safety member cooperating with said latchbolt and having means to release said deadlockingmechanism from saidblocking means when the door is closed.

at. In a lock, the combination with a spring projected latch bolt and adead-locking member therefor, of a roll-back for said member operablefrom the inner side of the door, means to prevent operation of saidroll-back when the door is open and means to automatically release saidroll-back when the door is closed. 7 5. In a lock, the combination witha spring projected latch bolt and dead-locking member therefor, of aroll-back for operating said member from the inner side of the door, ablocking dog operating with said roll'back, said dog being arranged toprevent rotation of said roll-back when said dead-locking member is ininoperative position, and means for automatically releasing saidblocking member when the door is closed.

6. In a lock, the combination with a latch Copies of this patent may beobtained for. five cents each, by addressing the Commissioner ofPatents, Washington, D. 0..

